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【单选题】
【气缸套的检修】在船上吊缸检查气缸套时,不必______。
A.
测量缸套直径
B.
观察缸套表面
C.
疏通注油注油器
D.
清理气缸套冷却水腔水垢
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参考答案:
举一反三
【简答题】扁桃体肿大的分度
【判断题】Decide whether the following statements are true or false according to Text B. The ironies are that annual losses in export earnings in most West African cotton-producing countries are comparable to U...
A.
正确
B.
错误
【多选题】薁类化合物的性质有
A.
可溶于水
B.
可溶于乙醚
C.
有颜色
D.
具有一定的芳香性
E.
可溶于65%的硫酸或磷酸
【判断题】薁类化合物沸点高,不溶于水,但可溶于60%~65%的硫酸。( )
A.
正确
B.
错误
【单选题】短文 3 It is one of nature’s great ironies that the availability of nitrogen in the soil frequently sets an upper limit on plant growth even though the plants leaves are bathed in a sea of nitrogen gas....
A.
That of a farmer whose crops have failed because the normal midseason rains did not materialize and no preparations for irrigation had been made.
B.
That of a long-distance runner who loses a marathon race because of a wrong turn that cost him twenty seconds.
C.
That of a motorist who runs out of gas a mere five miles from the nearest gas station.
D.
That of shipwrecked sailors at sea in a lifeboat, with one flask of drinking water to share among them.
E.
That of travelers who want to reach their destination as fast and as cheaply as possible, but find that cost increases as travel speed increases.
【单选题】薁类化合物可溶于
A.
强碱
B.
弱碱
C.
强酸
D.
弱酸
E.
【判断题】具有替代性的农产品之间,一种农产品的价格上涨时,另一种农产品的需求量会增加。
A.
正确
B.
错误
【判断题】薁类化合物沸点高,不溶于水,但可溶于60%~65%的硫酸。
A.
正确
B.
错误
【简答题】忽报人间曾伏虎, 。
【简答题】“忽报人间曾伏虎”中“伏虎”的意思是指( )。
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